Picking up a built 2006 RXP215. What should I look for?

I got an ok for this ski at $3,500 to pick up on Saturday. How does the mod list look? What should I look out for on the blower? Anything that I should inspect or take a look at before signing the bill of sale? Thank you in advance.

He said "I have a built engine with all performance parts valves can hold 10k rpms I was going to turbo it that now it is built but I lost interest when I bought a boat".

it is an 05. Always have a budget for repairs for a ski that has had significant work done and someone you trust that has worked successfully on them before. If you can get some warranty, that would be a HUGE bonus, but for his price, I highly doubt a warranty will be offered.

Compression test and leakdown on the motor and ride it. There are some aftermarket parts you can see, but I would be skeptical on a "fully built" motor that he just never did anything with. I would pry ask for reciepts on that. Past that, it looks like a slean ski, ust make sure it all works before you throw down the cash.